General Information:
Chemical Formula:
Ca9H2Si6O18(OH)8·6(H2O)
Composition:
(Molecular Weight = 1,063.37 gm)
Calcium 33.92 % Ca
Silicon 15.85 % Si
Hydrogen 2.09 % H
Oxygen 48.15 % O
Empirical Formula:
Ca9H2Si6O18(OH)8·6(H2O)
Environment:
Late stage mineral in metamorphosed limestone.
IMA Status:
Approved IMA 1966
Locality:
Crestmore Quarry, 5 miles NW of Riverside, Riverside Co. California.
Name Origin:
Named for Clarence Marvin Jenni (1896-1973), American mineral collector and director of the Geological Museum, University of Missouri.
Physical Properties:
Cleavage:
[001] Distinct
Color:
white.
Density:
2.32 - 2.33, Average = 2.32
Habits:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Platy - Sheet forms (e.g. micas).,
Hardness:
3.5 - Copper Penny
Luminescence:
Sometimes Fluorescent, Short UV=weak white.
Luster:
Vitreous (Glassy)
Streak:
white
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